Safety-vent for expansion-drums.



G. E. HULSE. SAFETY VENT FOR EXPANSION DRUMS.

APPLICATION FILED JUNE 24, 1907.

Patented July 5, 1910.

WITNESSES.

GEORGE E. HULSE, or NEWARK, NEW JERSEY, ASSIGNOR "To SAFETY can HEATIN a LIGHTING COMPANY, A CORPORATION on NEW JERSEV Specification of Letters Patent.

SAFETY-VENT FOR EXPANSION-DRUMS.

Patented July 5,1910.

Application filed June 24, 1907. Serial No. 380,597.

To all whom a may mm.-

Be it known that I, GEORGE. E. Home,

residing at Newark, in the county of Essex and Stat'eiof New, Jersey, have invented certain new and useful Improvements in Safety-Vents for Expansion-Drums, of which the following is full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and usethe same.

This invention relates broadly to safety valves but more especially to a valve adapted automatically to relieve abnormal pres sures occurring in the expansion tanks of water circulating systems.

One of the objects of my invention is to provide a device of the above character, such that while the same is entirely sure and reliable in its operation, it will automatically re-set itself after the abnormal pressure in the system has been relieved.

Another object is to provide a safety vent particularly adapted for use with water circulatlng systems employed in rallway cars or like structures in which the cost of maintenance is reduced to a minimum and in partpointed out hereinafter.

which may 'be'set' to vent at any desired pressure. 7 t

Otherobjects willbe in part obvious and The invention accordingly consists in the features of construction, combinations of elements and arrangements of'parts which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated inthe following claims.

In the accompanying drawings wherein is illustrated one of the various possible embodilnents of my invention: Figure 1 is a verticalsectional view of the same, F 2 is a top plan view of the lower portion of the casing thereof. Fig. h is a view of the same inside elevation.

Similar reference characters refer to similar parts througlumt the several views of the drawing.

Referring now to the drawing wherein I have shown'a safety vent for water circulating systems. particularly adapted for em on above shoulder 6, said cap piece being firmly clamped in position by means of a shouldered ring 8; a shoulder 10 of which engages an opposed shoulder 11 of the cap piece said ring having a threaded engagement with the upper portion of the casing exteriorly thereof.

Leading from the central portion of chamher 1 is an outlet passage-way 12 which dischargesinto the atmosphere. The inner terminal of passageway 12 is raised as shown at 13 and formed into a tapered valve seat upon which the central portion of the flexible diaphragm is adapted to rest, said portion constituting a valve to close said pas sage-way. The diaphragm is'held in engagement with its seat by means of a block 14 the lower portion of which is shaped to the upper portion of cap piece 7. ,A'lock nut is threaded upon adjusting screw 18 and takes against the upper surface of cap piece 7. The upper portion of adjusting screw lS'is squared or otherwise shaped to accommodate a wrench or other turning'implemcnt and a protecting cap piece 19 covers the upper end of the ad sting screw and has threaded engagement exteriorlyof cap piece 7. v

The operation-of this embodiment of my invention which should to a large extent be obvious from above description is'su ostan tially as follows. It is to be understood, of course, that the diaphragm is normally held in the position shown by means of the coil spring and that the adjusting screw 18 may be set to hold the diaphragm in such position with any desired degree of pressure so that the same will be raised to vent at a pre-detcrmined pressure within the expan sion tank. Upon the occurrence of such l o normal pressure within the expansion tank the internal pressure within chamber 4 will operate to lift the diaphragm which in turn will lift block 14 against the tension of its spring whereby the compressed fluid will be allowed to vent through discharge passage-way 12 to the atmosphere.

It will accordingly be seen that I have pr'ovideda construction well adapted to attain among others the above mentioned objects and ends of my invention in an exceed ingly simple and eflicient manner. I Owing to the fact that the internal pressure within the chamber of the e/casing acts upon a large portion of the diaphragm exa relation, it is obvious that the same may be employed to great advantage in other anal- 1 ogous relations although it is particularly adapted for use in the relation shown As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. I i

' It is also to be understood that the language used inthe following claims is intended to cover all of the generic and specific features of the invention herein described I and all statements of the scope of the invention which, as a matter of language, might be said to fall therebet-ween.

Having described my invention, What I claim as new. and desire to secure by Letters Patent is 2- 1. In a safety vent for water circulating systems, in combination, a casing adapted to be connected with theexpjansion tank of a water circulating system, a chamber provided within said casing, one wall of which passageway-having a tapered valve seat formed upon its inner terminal, a portion of sald diaphragm resting upon said valve seat,

a block shaped to conform with said valve seat located upon the opposite side of said diaphragm and" adapted to hold the same in contact with said seat, a coil spring engaging said block, and means for adjusting the ten- .sion of said spring.

2. In a vent for water circulating systems, in combmation, a casing adapted to be connected with the expansion tank thereof, ha ving a chamber in communication with the expansion tank by means of a passage-way leading through said casing, said casing also having a passage-way leading from said chamber to the atmosphere, a partially tapered valve seat provided upon the inner terminal of the latter passage-way, a flexible diaphragm stretched across said chamber and forming a wall thereof, thecentral portion of said diaphragm resting upon said valve seat and constituting a valve therefor, resilient means for pressing said diaphragm against said seat, comprising a pair of opposed blocks one of said blocks being shaped to conform with said valve seat, a 0011 spring interposed between said blocks, a set screw engaging said blocks, said set screw being adapted to be operated to adjust the tension of said spring, and a cap covering said set screw.

In testimony whereof I afiix my signature, in the presence of two witnesses.

. GEORGE E. HULSE.

Witnesses Fnnnnmon E; Knssmenn, E. E. ALLBEE. 

